Etymologies

Examples

"Nevertheless, it appears that these unique specialized spermatogonial cells could be an easily obtained and manipulated source of stem cells with exactly the same capability to form new tissues that we see in embryonic stem cells."

The current breakthrough represents the culmination of many years of work by Dr. Rafii and his lab, including their research in converting adult mouse spermatogonial stem cells to endothelial cells (Nature, September 2007) and in deriving stable, copious endothelial cells from human embryonic stem cells (Nature Biotechnology, Jan. 17, 2010).

We discussed spermatogenesis -- how we got from a diploid spermatogonial stem cell to a haploid spermatid -- and then spermiogenesis -- the process by which the spermatids acquire the features of spermatozoa: tails, acrosomes and the like.

By the time they get here they have traveled through about 6-7 meters of male reproductive tract in a journey (most of which is not under their own power) that takes roughly 20 days from the first division of the spermatogonial stem cell until they arrive in the cauda.